General Chat / The Shining

Could anyone help me out? I've been wondering these questions since I watched it for the first time last night.

1. Could Jack "shine?"
2. Was the woman in the bathroom really there, or was she a hallucination?
3. Was the woman in the bathroom the wife of the caretaker who killed his family?
4. Will Danny get control of his body?
5. Why did the butler tell Jack that he (the butler) was the caretaker, then a few minutes later tell Jack that he (Jack) had always been the caretaker?
6. What was the significance of showing to photo of Jack at the end?